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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   Micro QR code is a smaller version of the QR code standard for applications where symbol size is limited. There are four different versions (sizes) of Micro QR codes: the smallest is 11×11 modules; the largest can hold 35 numeric characters, [85] or 21 ASCII alphanumeric characters, or 15 bytes (128 bits).

3. Reed–Solomon error correction - Wikipedia

   en.wikipedia.org/wiki/Reed–Solomon_error...

   The first element of a CIRC decoder is a relatively weak inner (32,28) Reed–Solomon code, shortened from a (255,251) code with 8-bit symbols. This code can correct up to 2 byte errors per 32-byte block. More importantly, it flags as erasures any uncorrectable blocks, i.e., blocks with more than 2 byte errors.

4. MeCard (QR code) - Wikipedia

   en.wikipedia.org/wiki/MeCard_(QR_code)

   Compared to vCard, it needs very few chars due to the size limitation of QR Codes. QRCode MeCard example using most of the format's fields QR Code MeCard example containing the text MECARD:N:Doe,John;TEL:13035551212;EMAIL:john.doe@example.com;; Limitations

5. Data Matrix - Wikipedia

   en.wikipedia.org/wiki/Data_Matrix

   An example of a Data Matrix code, encoding the text: "Wikipedia, the free encyclopedia". A Data Matrix is a two-dimensional code consisting of black and white "cells" or dots arranged in either a square or rectangular pattern, also known as a matrix. The information to be encoded can be text or numeric data. Usual data size is from a few bytes ...

6. PDF417 - Wikipedia

   en.wikipedia.org/wiki/PDF417

   PDF417. PDF417 is a stacked linear barcode format used in a variety of applications such as transport, identification cards, and inventory management. "PDF" stands for Portable Data File. The "417" signifies that each pattern in the code consists of 4 bars and spaces in a pattern that is 17 units (modules) long.

7. Add or disable 2-step verification for extra security - AOL Help

   help.aol.com/articles/2-step-verification...

   6. Scan the QR code using your authenticator app. 7. Click Continue. 8. Enter the code shown in your authenticator app. 9. Click Done. Sign in with 2-step for authenticator app. 1. Sign in to your AOL account with your password. 2. Enter the verification code shown in your authenticator app. 3. Click Verify.

8. Rectangular Micro QR Code - Wikipedia

   en.wikipedia.org/wiki/Rectangular_Micro_QR_Code

   Rectangular Micro QR Code (also known as rMQR Code) is two-dimensional (2D) matrix barcode invented and standardized in 2022 by Denso Wave as ISO/IEC 23941. [2] rMQR Code is designed as a rectangular variation of QR code and has the same parameters and applications as original QR code.

9. Code 39 - Wikipedia

   en.wikipedia.org/wiki/Code_39

   Code 39 (also known as Alpha39, Code 3 of 9, Code 3/9, Type 39, USS Code 39, or USD-3) is a variable length, discrete barcode symbology defined in ISO/IEC 16388:2007. The Code 39 specification defines 43 characters, consisting of uppercase letters (A through Z), numeric digits (0 through 9) and a number of special characters ...